Lianja Requires Chilkat v11.0.0+

Remove an Entry from an Existing ZIP Using DeleteEntry

See more Zip Examples

This example demonstrates how to use the DeleteEntry method to remove a file from an existing ZIP archive.

The example:

• Creates a ZIP archive containing three text files
• Opens the ZIP archive for modification
• Finds and deletes one entry
• Writes the modified ZIP archive to a new filename

Suppose the original ZIP archive contains:

a.txt
b.txt
c.txt

After deleting b.txt, the modified ZIP archive contains:

a.txt
c.txt

The entry is removed only from the in-memory ZIP object until a Write* method is called.

Lianja

llSuccess = .F.

//  ------------------------------------------------------------
//  First create a ZIP archive containing three text files.

loZip = createobject("CkZip")

llSuccess = loZip.NewZip("original.zip")
if (llSuccess = .F.) then
    ? loZip.LastErrorText
    release loZip
    return
endif

lcCharset = "utf-8"

llSuccess = loZip.AddString("a.txt","Contents of file A",lcCharset)
if (llSuccess = .F.) then
    ? loZip.LastErrorText
    release loZip
    return
endif

llSuccess = loZip.AddString("b.txt","Contents of file B",lcCharset)
if (llSuccess = .F.) then
    ? loZip.LastErrorText
    release loZip
    return
endif

llSuccess = loZip.AddString("c.txt","Contents of file C",lcCharset)
if (llSuccess = .F.) then
    ? loZip.LastErrorText
    release loZip
    return
endif

//  Write the ZIP archive to disk.
//  
//  The ZIP now contains:
//  
//      a.txt
//      b.txt
//      c.txt
//  
llSuccess = loZip.WriteZipAndClose()
if (llSuccess = .F.) then
    ? loZip.LastErrorText
    release loZip
    return
endif

//  ------------------------------------------------------------
//  Open the existing ZIP archive for modification.

loZip2 = createobject("CkZip")

llSuccess = loZip2.OpenZip("original.zip")
if (llSuccess = .F.) then
    ? loZip2.LastErrorText
    release loZip
    release loZip2
    return
endif

//  Find the entry named "b.txt".
loEntry = createobject("CkZipEntry")

llSuccess = loZip2.EntryOf("b.txt",loEntry)
if (llSuccess = .F.) then
    ? loZip2.LastErrorText
    release loZip
    release loZip2
    release loEntry
    return
endif

//  Remove the entry from the in-memory ZIP object.
//  
//  At this point, the original ZIP file on disk is unchanged.
//  The deletion takes effect only after WriteZip or
//  WriteZipAndClose is called.
llSuccess = loZip2.DeleteEntry(loEntry)
if (llSuccess = .F.) then
    ? loZip2.LastErrorText
    release loZip
    release loZip2
    release loEntry
    return
endif

//  Write the modified ZIP archive to a new file.
loZip2.FileName = "modified.zip"

llSuccess = loZip2.WriteZipAndClose()
if (llSuccess = .F.) then
    ? loZip2.LastErrorText
    release loZip
    release loZip2
    release loEntry
    return
endif

//  The modified ZIP now contains:
//  
//      a.txt
//      c.txt
//  

? "ZIP archive updated successfully."


release loZip
release loZip2
release loEntry